20

2023-09

Power contraction of RAS with local impedance problems for the Helmholtz equation

报告题目：Power contraction of RAS with local impedance problems for the Helmholtz equation报告摘要：The   Helmholtz equation is notoriously difficult to solve, especially for the case   of high wavenumber. The Restricted Additive Schwarz preconditioner with local   impedance problems (often called the ORAS method) is arguably the most   successful one-level...

20

2023-09

非定常Ginzburg-Landau方程的保结构有限元算法

报告题目：非定常Ginzburg-Landau方程的保结构有限元算法报告摘要：对于时间规范下的非定常Ginzburg-Laudau 方程，我们提出了一类物理边界条件下的非线性有限元算法，避免了因额外边界条件导致的非物理数值现象。对该非线性格式我们设计了数值有效的预条件子，并分析了其有效性，将该非线性格式的计算量降至线性解耦格式计算量同一量级的同时保证了数值能量的稳定性。我们还提出了一类保持无条件能量耗散和离散极值原理的解耦...

20

2023-09

Few-shot Learning and Calibrating Deep Networks

报告题目：Few-shot Learning and Calibrating Deep Networks报告人：Prof. Ismail Ben Ayed （加拿大魁北克大学）时间：2023年5月29日（周一）上午10:00开始地点：海纳院2幢203教室报告人简介：Ismail Ben Ayed教授是魁北克大学高等工程学院（ETS）医学图像与人工智能的首席教授，蒙特利尔大学医学研究中心（CRCHUM）成员，是有卓越研究成果的年轻专家。主要研究工作集中在将现代优化计算方法成功应用于医学图像分析、计算视觉及...

20

2023-09

Steinberg’s cross-section of Newton strata

数论与表示论讨论班Number Theory and Representation Theory SeminarTime: May 31, Wednesday, 15:00-16:00 Venue: 数学高等研究院Lecture HallSpeaker: 聂思安Sian Nie (Academy of Mathematics and Systems Science)Title: Steinberg’s cross-section of Newton strataAbstract: Let G be a simply connected semisimple group of rank r over an algebraically closed field. Steinberg has associated to each minimal lengt...

20

2023-09

Harder-Narasimhan stratification in p-adic Hodge theory

数论与表示论讨论班Number Theory and Representation Theory SeminarTime: May 31, Wednesday, 16:15-17:15 Venue: 数学高等研究院Lecture HallSpeaker: 陈苗芬Miaofen Chen (East China Normal University)Title: Harder-Narasimhan stratification in p-adic Hodge theoryAbstract: we will talk about the construction of Harder-Narasimhan stratification on the B_{dR}^+-Grassmannian  and study its basic geometri...

20

2023-09

RC-positivity and the geometry of compact complex manifolds

杰出青年数学家系列讲座Time: June 1, Thursday, 16:00-17:00 Venue: 海纳苑2幢210室Speaker: 杨晓奎 Xiaokui Yang (Tsinghua University)Title: RC-positivity and the geometry of compact complex manifolds. Abstract: In this talk we will present some recent progress on the geometry and topology of compact complex manifolds with RC-positive tangent bundles.简介杨晓奎，清华大学数学科学系教授。2012年毕业于美国...

20

2023-09

非线性密码组件的设计与分析

  

20

2023-09

Spectral Clustering: Methodology and Statistical Analysis

报告题目：Spectral Clustering: Methodology and Statistical Analysis报告人：章叶（宾夕法尼亚大学）报告时间：2023年6月2日（周五）16:00报告地点：海纳苑2幢312摘要：Spectral clustering is one of the most popular algorithms to group high-dimensional data. It is easy to implement, computationally efficient, and has achieved tremendous success in many applications. The idea behind spectral clustering is d...

20

2023-09

An optimal control of a variable-order fractional PDE

报告题目：An optimal control of a variable-order fractional PDE报告人：王宏（南卡罗莱纳大学教授）报告时间：2023年6月5日10:00报告地点：海纳苑2幢102主要内容：Integer-order diffusion partial differential equations (PDEs) were derived under the assumptions that the underlying particle movements have (i) a mean free path and (ii) a mean waiting time, which hold for the diffusive transport of solut...

20

2023-09

深度学习中的Adam类算法：收敛性分析以及在双层规划中的应用

报告题目：深度学习中的Adam类算法：收敛性分析以及在双层规划中的应用报告人：胡潇尹（浙大城市学院）报告时间：2023年6月7日（周三）16:00报告地点：海纳苑2幢105摘要：本报告主要关注Adam类方法在求解非光滑优化问题，特别是在训练非光滑的深度神经网络时的收敛性分析。我们提出了一个统一的双时间尺度步长（two-timescale stepsize）的理论框架，应用微分包含（differential inclusion）来分析Adam类方法所产生迭代点的极限性...

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